A Particular Disease of the Nervous System Specifically Involves the Ca²⁺

question 205

Multiple Choice

A particular disease of the nervous system specifically involves the Ca²⁺ channels at the chemical synapses of motor neurons where neurotransmitter is stored and released.This disease therefore affects the

• A) axon terminals of the presynaptic cell and the release of acetylcholine.
• B) axon terminals of the postsynaptic cell and the release of K⁺.
• C) movement of Na⁺ out of the postsynaptic cell.
• D) axon terminals of the presynaptic cell and the release of K⁺.
• E) axon terminals of the postsynaptic cell and the release of Cl^-.

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Definitions:

Terminal Buttons

Terminal buttons are the small nodules at the end of axons that release chemical neurotransmitters, which facilitate the transmission of signals from one neuron to another.

Axons

Long, threadlike parts of a nerve cell along which impulses are conducted from the cell body to other cells.

Dendrites

Branch-like extensions of neurons that receive signals from other neurons and transmit them toward the cell body.

Synaptic Cleft

The small gap between neurons at a synapse, through which neurotransmitters are released to transmit signals to adjacent neurons.